The Camel Audio Artists page lists BT as an avid fan and supporter of the Alchemy synth. He is quoted on the site:
"This is the best synth I have ever used in my entire life. Hard or soft synth, the most elegant, animated, beautiful, evocative synthesizer ever made."
"You can hear Camel Audio software in BT's scores for 'Monster', 'The Underclassman' and 'Stealth'."

COFFEY: What are you using these days for production? Hardware, software, all in box, etc?
KURSA: KRK Rokit 8 G2?s, MacBook Pro, Logic 9, Camel Audio (Alchemy and Fabfilter Pro-Q are featured in everything I do!) Oh, and most recently my Nintendo DSi with the Corgi DS10 game is going to be featured in a LOT of my works. I love it so much :D

Prior to the Apple take over, I only heard of this synth or of their many plugins. I came into production around the time they had dropped off the map. Obviously, I got this with the big 10.2.1 Logic update and it's a pretty awesome include. It's got a lot of stock sounds that sound really good. The pads seem really interesting. Most samples are quality and it's getting a lot of updates through Apple, which is great.

I use the great Camel Audio synthesizer since 2010 and I own every sound library which is ever made. Right from the beginning I use the great Alchemy in almost every track I made in several projects. The Alchemy has never made me bored and it always suprises me again. I need at least 100 years more to get everything out of it, the possibilities are endless. I like Re-synthese as my fav synthese, it has all on board. This powerfull synth made my music for what it is 'my own style' without it my world would probably look very different these days. One note: unfortunatly Camel Audio deceased in 2015. In the meanwhile Logic has integrate Alchemy in Logic X but not in Logic 9. I Use Logic 9 and the latest old Alchemy version.